gov.lanl.IDViewer
Class ImageCanvas

java.lang.Object
  |
  +--java.awt.Component
        |
        +--java.awt.Canvas
              |
              +--gov.lanl.IDViewer.ImageCanvas

All Implemented Interfaces:

javax.accessibility.Accessible, java.awt.image.ImageObserver, java.awt.MenuContainer, java.io.Serializable

public class ImageCanvas

extends java.awt.Canvas

The class ImageCanvas implements a display canvas for images.

See Also:

Serialized Form

Field Summary

Fields inherited from class java.awt.Component

BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT

Fields inherited from interface java.awt.image.ImageObserver

ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH

Constructor Summary

ImageCanvas(java.awt.Image im)
constructs an image canvas for a given image

ImageCanvas(java.awt.Image im, boolean icon)
creates an image canvas for a given image and resizes it to icon size if necessary

ImageCanvas(java.awt.Image im, int x, int y)
constructs an image canvas of a specified size

ImageCanvas(java.net.URL base, java.lang.String ref)
creates an ImageCanvas from the image at this URL, full size

ImageCanvas(java.net.URL base, java.lang.String ref, boolean icon)
creates an ImageCanvas from the image at this URL, icon size

Method Summary

int	getHeight() gets the height of the image displayed on the canvas
int	getWidth() gets the width of the image displayed on the canvas
void	paint(java.awt.Graphics g) draws the image in the canvas
void	reset(java.awt.Image im) changes the image displayed on the canvas and repaints the image canvas
void	reset(java.awt.Image im, int x, int y) changes the image displayed on the canvas, resizes the images, and repaints the image canvas
void	update(java.awt.Graphics g) overwrites the component updates to prevent erasing, i.e., flickering

Methods inherited from class java.awt.Canvas

addNotify, createBufferStrategy, createBufferStrategy, getAccessibleContext, getBufferStrategy

Methods inherited from class java.awt.Component

action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, bounds, checkImage, checkImage, coalesceEvents, contains, contains, createImage, createImage, createVolatileImage, createVolatileImage, deliverEvent, disable, disableEvents, dispatchEvent, doLayout, enable, enable, enableEvents, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, getAlignmentX, getAlignmentY, getBackground, getBounds, getBounds, getColorModel, getComponentAt, getComponentAt, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeys, getFocusTraversalKeysEnabled, getFont, getFontMetrics, getForeground, getGraphics, getGraphicsConfiguration, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getListeners, getLocale, getLocation, getLocation, getLocationOnScreen, getMaximumSize, getMinimumSize, getMouseListeners, getMouseMotionListeners, getMouseWheelListeners, getName, getParent, getPeer, getPreferredSize, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getSize, getToolkit, getTreeLock, getX, getY, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, invalidate, isBackgroundSet, isCursorSet, isDisplayable, isDoubleBuffered, isEnabled, isFocusable, isFocusCycleRoot, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isOpaque, isShowing, isValid, isVisible, keyDown, keyUp, layout, list, list, list, list, list, locate, location, lostFocus, minimumSize, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, paramString, postEvent, preferredSize, prepareImage, prepareImage, print, printAll, processComponentEvent, processEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processKeyEvent, processMouseEvent, processMouseMotionEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removeNotify, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, repaint, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, reshape, resize, resize, setBackground, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setEnabled, setFocusable, setFocusTraversalKeys, setFocusTraversalKeysEnabled, setFont, setForeground, setIgnoreRepaint, setLocale, setLocation, setLocation, setName, setSize, setSize, setVisible, show, show, size, toString, transferFocus, transferFocusBackward, transferFocusUpCycle, validate

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

ImageCanvas

public ImageCanvas(java.net.URL base,
                   java.lang.String ref)

creates an ImageCanvas from the image at this URL, full size

Parameters:

base - the base URL

ref - the image filename from the base URL

ImageCanvas

public ImageCanvas(java.net.URL base,
                   java.lang.String ref,
                   boolean icon)

creates an ImageCanvas from the image at this URL, icon size

Parameters:

base - the base URL

ref - the image filename from the base URL

icon - if true resize for icon

ImageCanvas

public ImageCanvas(java.awt.Image im)

constructs an image canvas for a given image

Parameters:

im - the image

ImageCanvas

public ImageCanvas(java.awt.Image im,
                   int x,
                   int y)

constructs an image canvas of a specified size

Parameters:

im - the image to use

x - the size in the x direction

y - the size in the y direction

ImageCanvas

public ImageCanvas(java.awt.Image im,
                   boolean icon)

creates an image canvas for a given image and resizes it to icon size if necessary

Parameters:

im - the image

icon - if true resize to an icon

Method Detail

reset

public void reset(java.awt.Image im)

changes the image displayed on the canvas and repaints the image canvas

Parameters:

im - the image to use

reset

public void reset(java.awt.Image im,
                  int x,
                  int y)

changes the image displayed on the canvas, resizes the images, and repaints the image canvas

Parameters:

im - the image to use

x - the width to resize to

y - the height to resize to

paint

public void paint(java.awt.Graphics g)

draws the image in the canvas

Overrides:

paint in class java.awt.Canvas

Parameters:

g - the graphics context

getWidth

public int getWidth()

gets the width of the image displayed on the canvas

Overrides:

getWidth in class java.awt.Component

Returns:

the image's width

getHeight

public int getHeight()

gets the height of the image displayed on the canvas

Overrides:

getHeight in class java.awt.Component

Returns:

the image's height

update

public void update(java.awt.Graphics g)

overwrites the component updates to prevent erasing, i.e., flickering

Overrides:

update in class java.awt.Canvas